/*
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public
    License as published by the Free Software Foundation; either
    version 2 of the license, or (at your option) any later version.
*/

package org.gjt.jclasslib.io;

import org.gjt.jclasslib.bytecode.AbstractInstruction;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

/**
 * Converts a list of instructions as defined in the package
 * <tt>org.gjt.jclasslib.code</tt> to code.
 *
 * @author <a href="mailto:jclasslib@ej-technologies.com">Ingo Kegel</a>
 * @version $Revision: 1.1 $ $Date: 2005/11/01 13:18:23 $
 */
public class ByteCodeWriter {

    private ByteCodeWriter() {
    }

    /**
     * Converts a list of instructions to code.
     *
     * @param instructions the <tt>java.util.List</tt> with the instructions
     * @return the code as an array of bytes
     * @throws IOException if an exception occurs with the code
     */
    public static byte[] writeByteCode(List instructions) throws IOException {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ByteCodeOutputStream bcos = new ByteCodeOutputStream(baos);

        for (Object instruction : instructions) {
            writeNextInstruction(bcos, (AbstractInstruction) instruction);
        }
        bcos.close();
        return baos.toByteArray();
    }

    private static void writeNextInstruction(ByteCodeOutputStream bcos,
                                             AbstractInstruction instruction)
            throws IOException {
        instruction.write(bcos);

    }

}
